You are going to need to take some lift out of that hull. Looking at in the pics it appears as though the hull will pack a lot of air. Notching the sponsons like the whiplash helps, but its tough. I have seen the sunny side of 80mph in a sport hydro and than seen my boat implode stuffing at that speed. It's a real tricky thing and the guys that do it well know their stuff and have likely wrecked enough gear to learn some hard lessons like me.
Another option might be an air dam at the front of the tunnel to impede the air flow. I have not tried that on any of my hulls, but have seen people do it for oval setups in 1/8 scales.